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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cab85d2f16995457faa5c195031579b13a9bb526518b548b0cba437826e1503' 
  AND token = 'MYmMucohOuFfjE06k4Hvnslz0+i/ivXhAfMk2LJkO+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}